What's her job?
Say what is she doing:

Librarian
She is organizing books
Friend: Are you at work?
Librarian: Yes. I ________ ________ some new books.
(organize)
am organizing
What's his job?
Say what is he doing:
Professor
He is teaching
Friend: Are students asking for help?
Librarian: A few, but I ________ ________ anyone right now.
(not / help)
am not helping
What's her job?
Say what is she doing:
Lab Technician
She is working in the lab
Parent: Are you on your break?
Server: Not yet. I (1) ________ ________ drinks right now.
(serve)
Parent: Are people eating already?
Server: Some are, but others (2) ________ ________ yet.
(not / eat)
(1) I am serving
(2) are not eating
What's her job?
Say what is she doing:
Student Assisstant
She is helping a student
Sibling: What are you doing?
Technician: I (1) ________ ________ the machines in the lab.
(check)
Sibling: Are you fixing something?
Technician: No, I (2) ________ ________ anything at the moment.
(not / fix)
(2) am not fixing
What's his job?
Say what is he doing:

Cafeteria worker
He is serving food
Partner: Can you talk now?
Professor: Just for a minute. (1) I ________ ________ a class.
(teach)
Partner: Are you free after lunch?
Professor: Maybe. I (2) ________ ________ meetings this afternoon.
(not / have)
(1) I'm teaching
(2) I'm not having